Screen Readers

A screen reader is software that converts on-screen text, controls, and layout information into speech or refreshable braille output, allowing people who are blind or have low vision to use computers, mobile devices, and websites without relying on visual information. This page is a general educational overview of how screen readers work; it does not function as a manual for any single product.

WHO MAY USE A SCREEN READER

Screen readers are used primarily by people who are blind or have significant low vision, though some people with certain learning, cognitive, or attention-related conditions also use screen readers or text-to-speech tools to support reading. Screen reader use ranges from occasional support for specific tasks to full-time reliance for all computer and mobile device use.

SCREEN-READER INTERACTION CONCEPTS

Screen readers generally read content aloud in a structured order and allow the user to navigate by specific elements, such as headings, links, or form fields, rather than only reading straight through a page from top to bottom. Learning these navigation concepts is central to using a screen reader efficiently, since it allows a user to jump directly to the content they need.

KEYBOARD NAVIGATION

Because screen reader users typically cannot rely on a mouse to see and click visual elements, keyboard navigation is central to screen reader use. Standard keyboard commands allow moving between links, buttons, form fields, and other interactive elements without a pointing device.

FOCUS

Screen readers track and announce which element currently has keyboard focus, such as a button or text field, so the user knows what they are interacting with even without seeing the screen. Well-structured websites and applications make focus predictable and easy to follow.

HEADINGS

Headings act as a table of contents for screen reader users, who can often jump directly between headings to understand a page's structure and locate the section they need without listening to the entire page.

LINKS

Screen readers can list all links on a page and read link text aloud, which is why descriptive link text is important; a list of links that all say "click here" provides little useful information out of context.

FORMS

Screen readers announce form field labels, current values, and requirements, such as whether a field is required. Clearly labeled forms allow a screen reader user to understand what information is being requested and confirm their entries.

TABLES

Screen readers can announce table headers and structure so that a user understands which row and column a piece of data belongs to, rather than hearing a table as an unstructured list of numbers or text.

IMAGES AND ALTERNATIVE TEXT

Screen readers rely on alternative text descriptions to convey the content or purpose of images, since they cannot interpret an image visually. Images without alternative text are typically skipped or announced only as "image," providing no information to the user.

DOCUMENTS

Screen readers can read many types of electronic documents, including word processing files and PDFs, though how well a document reads aloud depends heavily on whether it was created with accessible structure, such as proper headings and tagged content, rather than as a scanned image.

WEBSITES

Screen reader access to websites depends on how a site is built. Sites that use proper headings, labeled links and forms, and alternative text for images are generally much easier to navigate than sites that rely primarily on visual layout without underlying structure.

MOBILE DEVICES

Most modern smartphones and tablets include a built-in screen reader as part of their accessibility settings, allowing touch gestures to explore and activate items on the screen in combination with spoken feedback.

BRAILLE-DISPLAY INTEGRATION

Many screen readers can connect to a refreshable braille display, allowing output to be read in braille instead of or in addition to speech. This is covered in more detail on this site's Refreshable Braille and Braille Technology page.

SPEECH OUTPUT

Screen readers use synthesized speech to read content aloud, and most allow adjusting speech rate, pitch, and voice. Experienced users often increase speech rate significantly beyond typical conversational speed as they become more familiar with their screen reader.

LEARNING CURVE AND TRAINING

Screen readers have a real learning curve, since efficient use depends on memorizing keyboard commands and navigation strategies rather than visually scanning a screen. Structured training and consistent practice generally lead to significant gains in speed and confidence over time.

ACCESSIBILITY LIMITATIONS

Even well-designed screen readers cannot make inaccessible content fully usable; a poorly structured website, an untagged PDF, or an image without alternative text can remain difficult or impossible to understand no matter how capable the screen reader is. Screen reader effectiveness therefore depends on both the software and the accessibility of the content being read. For how websites, documents, and apps are built to work with screen readers, see Digital Accessibility.

TYPES OF SCREEN READERS

Screen readers generally fall into two categories. Built-in screen readers come included with an operating system at no additional cost, such as VoiceOver on Apple devices, TalkBack on Android, Narrator on Windows, and Orca on Linux. Third-party screen readers are installed separately and may be free or paid, and are most common on Windows computers. No single screen reader works best for everyone; the right choice depends on the operating system in use, budget, personal preference, and the specific tasks a person needs to accomplish. Many people begin with the screen reader already included on their device before considering whether a different option might serve them better.

GETTING STARTED

Most current computers, tablets, and phones already include a screen reader as part of their built-in accessibility settings, so many people begin there rather than purchasing separate software. Turning on a built-in screen reader typically takes only a few steps through the device's accessibility settings, though the exact menu names and locations change across software versions and are not listed here for that reason. For general information on paying for a specialized screen reader or other assistive technology when a built-in option does not meet a person's needs, see Funding Assistive Technology.

AUTHORITATIVE RESOURCES

For a broader overview of assistive technology tools people use to access the web, including screen readers, see Tools and Techniques from the Web Accessibility Initiative (W3C). For data on which screen readers and browsers people actually use, see the Screen Reader User Survey from WebAIM, a web accessibility research group based at Utah State University. For a plain-language introduction to screen reader technology and how it is used by people who are blind or have low vision, see Screen Readers from the American Foundation for the Blind. For a federal overview of assistive technology products that support access to printed and digital information, see Assistive Technology Products for Information Access from the National Library Service for the Blind and Print Disabled, Library of Congress.

ABOUT THIS PAGE

This page provides general educational information about screen readers and how they work. It is not a substitute for an individualized evaluation conducted by a qualified professional. Reviewed for educational and assistive technology content by Dr. Jeffrey Davis, PhD, ATP.

RELATED RESOURCES

For a broader discussion of vision-related access technology, see Vision & Low Vision. For refreshable braille and braille displays, see Refreshable Braille and Braille Technology. For screen magnification as an alternative or complement to screen readers, see Screen Magnification and Visual Access. For general guidance on matching technology to individual needs, see AT Assessment & Selection. For ongoing coverage of screen reader and other assistive technology developments, see AssistiveTechnologyNews.org, an information resource maintained by The Accessibility Clinic Inc.

For product-specific information, basic start and stop instructions, and authoritative documentation, see the following screen reader guides:

NVDA (NonVisual Desktop Access)

JAWS (Job Access With Speech)

VoiceOver (Apple Screen Reader)

Windows Narrator

ChromeVox (ChromeOS Screen Reader)